"We found that quite a lot of our visitors and patients just call into the hospital just to pick up prescriptions or do something quite quick and they couldn't do that within a 15 minute period of time," she said.

Ms Squires says the review revealed the paid parking system has improved parking availability at the hospital.

"What we were finding was that our fail to attend rates were going up and a lot of the reason for that was that people were driving around and around the hospital site trying to find a park.

They can now find a park so that level of stress is reduced for patients," she said.

Paid parking raises between $20,000 and $24,000 a week in revenue for the hospital however this may drop following the extension of the free parking.

Ms Squires estimates the car parking infrastructure will be paid off within a year, after that parking revenue will be directed to hospital facilities.